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Transmitter common faults

- Aug 07, 2017 -

1, the installation should make the transmitter pressure sensitive parts perpendicular to the direction of gravity, the transmitter (Figure 7) if the installation conditions are limited, it should be installed after the adjustment of the transmitter zero to the standard value.

2, the residual pressure is not released, so the sensor zero and not come down. The best way to eliminate this cause is to remove the sensor, see if the zero is normal, if the normal replacement of the seal and try again.

3, the pressure transmitter output does not change, and then press the transmitter output suddenly changes, the pressure transmitter transmitter zero back. The reason for this phenomenon is most likely caused by a pressure sensor seal.

4, whether the power supply requirements; power supply and the transmitter and the load device between the wiring error. If there is no voltage or polarity reversal on the transmitter terminals, the transmitter can output no voltage signal.

5, the pressure sensor and transmitter shell generally need to ground, the signal cable can not be mixed with the power cable laying, sensors and transmitters should avoid strong electromagnetic interference around. Sensors and transmitters should be tested in accordance with industry regulations in the use of transmitters (Figure 8).

6, the user in the choice of pressure sensors and transmitters, should be fully aware of the pressure measurement system conditions, according to the need for a reasonable choice, the system work in the best condition, and reduce the project cost.

7, through the separator and the filling fluid within the components sent to both sides of the measurement diaphragm. The diaphragm and the electrodes on both sides of the insulating sheet each form a capacitor.

8, the pressure transmitter is required to check once a week, once a month inspection, mainly to clear the dust inside the instrument, the electrical components carefully check the current value of the output should always proofread, the pressure transmitter internal is weak, To be electrically separated from the outside world.